Install PHP in Docker image

image/Dockerfile

@@ -1,5 +1,7 @@
 FROM debian:stable-slim
 
+ARG PHP_VERSION=8.2
+
 LABEL "com.github.actions.name"="Pantheon WordPress Deploy Action"
 LABEL "com.github.actions.description"="Deploys a WordPress site to Pantheon"
 LABEL "com.github.actions.icon"="send"
@@ -11,11 +13,28 @@ LABEL repository="https://github.com/10up/pantheon-wp-deploy-action"
 
 RUN apt-get update \
 	&& apt-get install -y curl \
+    apt-transport-https \
+    ca-certificates \
     git \
+    lsb-release \
     rsync \
+    wget \
 	&& apt-get clean -y \
 	&& rm -rf /var/lib/apt/lists/* 
 
+RUN wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg \
+  && echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | tee /etc/apt/sources.list.d/php.list \
+  && apt update \
+  && apt install -y \
+    php${PHP_VERSION} \
+    php${PHP_VERSION}-xml \
+    php${PHP_VERSION}-xmlrpc \
+    php${PHP_VERSION}-cli \
+    php${PHP_VERSION}-mbstring \
+    php${PHP_VERSION}-cli \
+  && apt-get clean -y \
+  && rm -rf /var/lib/apt/lists/* 
+
 RUN mkdir ~/terminus && \
   cd ~/terminus && \
   curl -L https://github.com/pantheon-systems/terminus/releases/download/`curl --silent "https://api.github.com/repos/pantheon-systems/terminus/releases/latest" | perl -nle'print $& while m#"tag_name": "\K[^"]*#g'`/terminus.phar --output terminus && chmod +x terminus && \